// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_VERSION_H_
#define BASE_VERSION_H_

#include <stdint.h>

#include <iosfwd>
#include <string>
#include <vector>

#include "base/base_export.h"

namespace base {

// Version represents a dotted version number, like "1.2.3.4", supporting
// parsing and comparison.
class BASE_EXPORT Version {
public:
    // The only thing you can legally do to a default constructed
    // Version object is assign to it.
    Version();

    Version(const Version& other);

    // Initializes from a decimal dotted version number, like "0.1.1".
    // Each component is limited to a uint16_t. Call IsValid() to learn
    // the outcome.
    explicit Version(const std::string& version_str);

    // Initializes from a vector of components, like {1, 2, 3, 4}. Call IsValid()
    // to learn the outcome.
    explicit Version(std::vector<uint32_t> components);

    ~Version();

    // Returns true if the object contains a valid version number.
    bool IsValid() const;

    // Returns true if the version wildcard string is valid. The version wildcard
    // string may end with ".*" (e.g. 1.2.*, 1.*). Any other arrangement with "*"
    // is invalid (e.g. 1.*.3 or 1.2.3*). This functions defaults to standard
    // Version behavior (IsValid) if no wildcard is present.
    static bool IsValidWildcardString(const std::string& wildcard_string);

    // Returns -1, 0, 1 for <, ==, >.
    int CompareTo(const Version& other) const;

    // Given a valid version object, compare if a |wildcard_string| results in a
    // newer version. This function will default to CompareTo if the string does
    // not end in wildcard sequence ".*". IsValidWildcard(wildcard_string) must be
    // true before using this function.
    int CompareToWildcardString(const std::string& wildcard_string) const;

    // Return the string representation of this version.
    const std::string GetString() const;

    const std::vector<uint32_t>& components() const { return components_; }

private:
    std::vector<uint32_t> components_;
};

BASE_EXPORT bool operator==(const Version& v1, const Version& v2);
BASE_EXPORT bool operator!=(const Version& v1, const Version& v2);
BASE_EXPORT bool operator<(const Version& v1, const Version& v2);
BASE_EXPORT bool operator<=(const Version& v1, const Version& v2);
BASE_EXPORT bool operator>(const Version& v1, const Version& v2);
BASE_EXPORT bool operator>=(const Version& v1, const Version& v2);
BASE_EXPORT std::ostream& operator<<(std::ostream& stream, const Version& v);

} // namespace base

#endif // BASE_VERSION_H_
